She restored three thousand pages of 1920s newspapers — and time itself

Ms. Xu's tools are a pair of tweezers, a brush, and a bowl of paste.

She is a paper conservator at a library, thirty-one years in the trade. Her workbench sits in a climate-controlled restoration room, and her "patients" are endlessly various: genealogies riddled by insects, family records stained by water, Republican-era newspapers gone brittle as autumn leaves, old letters glued themselves shut. Her job is to give each of them another hundred years of life.

The largest group of patients she ever treated was three thousand–odd pages of old Republican-era newspapers. When they were found in a basement, damp had fused them layer upon layer into "paper bricks," so brittle they crumbled at a touch. Some suggested scanning them digitally and sealing the originals away. Ms. Xu objected: "A paper brick stays sealed, and whatever it holds stays unknown forever. That is not wastepaper. That is every single day of a period decades past."

Unbinding the paper bricks took two years. Steam, a bamboo spatula lifting one hair's width at a time, endless adjustments of humidity and temperature — she thought of the three thousand pages as three thousand patients, each with its own illness and its own treatment. What emerged: trading-company advertisements, wedding and funeral notices, market prices, an entire page of a serialized martial arts novel. Historians used the pages to correct several details in the local history of the river-port trade.

The trade has a rule: restore old as old. The color, texture, and laid lines of the repair paper must match the original, and the mended places should be "invisible from afar, visible up close" — "people who come after us should be able to tell what has been repaired. That's honesty toward history." What the work demands most, Ms. Xu says, isn't nimble fingers but the ability to stay seated: a badly damaged page takes months, and a single motion repeated thousands of times. Most of her colleagues changed careers. She stayed, for a plain reason: "These things have waited decades, centuries, for one pair of hands willing to sit down."

The craftsperson repairs paper, but what is really being repaired is time. Every flattened page of an old newspaper is a stretch of years reopened — a restorer is time's midwife.

Among everything she has restored was one private commission: an old man's family genealogy. During the famine years his mother had sewn it into her padded coat to save it, and by the time it reached the old man it had broken into dozens of pieces. He searched until he found Ms. Xu and told her it was "the only thing our family carried out of the old home." She worked on it for four months. On the day she returned it, the man, in his eighties, brought his whole family. When they turned to the great-grandfather's name on the page, they bowed together, all of them. He said to her: "You didn't repair paper. You repaired our family's roots."

Ms. Xu now takes apprentices. Her first lesson isn't tools but looking: place a damaged page under the lamp and study it for an hour. "Understand how it was hurt, and you know how to treat it." When the apprentices grow restless, she tells them the reason: "In this trade, you won't restore more than a few thousand pieces in a lifetime. But every piece finished leaves someone, centuries from now, a road back that they can see."

On the wall of her restoration room hangs a strip of her own handwriting: "Slow is fast. Stillness is deep."